<!-- 层叠性 -->

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<head>
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    <title>层叠性</title>
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        div {
        color:red;
        font-weight:700;
        }

        div {
            color:green;
            font-size:30px;
        }
    </style>
</head>
<body>
    <div>层叠性</div>
</body>
</html>